Martin Sorrell's driver had worked for the WPP CEO for 15 years, ferrying the advertising king around London in a Range Rover. Last autumn, his job came to an abrupt end. An extra-long chauffeuring shift — after he had worked 12 days on the trot — had finished with a request to pick up Sorrell's wife, Cristiana, from a Mayfair restaurant and drop her at the couple's Belgravia home. It was 2am, and the driver was told he needed to be back five hours later for another job. He refused, claiming he had a previous appointment and, in any case, would not be safe on the road with just two or three hours' sleep. Sorrell fired him the next day. Neither man would have known at the time that this moment of executive intemperance would help to trigger a chain of events that would lead to Sorrell stepping down from a business he had spent 33 years building — transforming a maker of wire supermarket baskets into the world's largest marketing and communications group.Since Sorrell resigned on Apri...

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